Checkout errors - Please help.

I've noticed I've been getting a few unusual errors lately. Sales from the website have been a little slower than usual lately and it may be down to the checkout playing up but I'm not sure what they mean.

I have attached a couple of screenshots which have been sent to me by a customer who claimed they could not put a sale in.

Also I have checked the error log and noticed that I have quite a few entries which read:

'Error: There was an error processing your payment: (15005 Processor Decline) This transaction cannot be processed.'

What does this usually mean? I've had 6 of the above error today alone.

That error can result from our anti-fraud measures, minFraud and google reCAPTCHA. Regarding the first error, if a customer submits the order and the reCAPTCHA verification doesn't complete, they'll see this error message. This can be caused by the customer simply not having checked the reCaptcha or not allowing the verification to complete, or, as in your screenshot, the customer isn't able to complete the verification because of the 2nd error. Which leads me to...